ext_external_objects: Remove unnecessary NULL check.
Fix defect reported by Coverity Scan.
Dereference before null check (REVERSE_INULL) check_after_deref: Null-checking attachments suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
Fixes: 8713fbda ("ext_external_objects: Vulkan framework additions") Signed-off-by: Vinson Lee vlee@freedesktop.org